diff options
Diffstat (limited to 'pkg/sentry/socket/netstack/netstack.go')
| -rw-r--r-- | pkg/sentry/socket/netstack/netstack.go | 40 |
1 files changed, 37 insertions, 3 deletions
diff --git a/pkg/sentry/socket/netstack/netstack.go b/pkg/sentry/socket/netstack/netstack.go index 48f5c6f30..b3546471e 100644 --- a/pkg/sentry/socket/netstack/netstack.go +++ b/pkg/sentry/socket/netstack/netstack.go @@ -174,6 +174,10 @@ var Metrics = tcpip.Stats{ }, } +// DefaultTTL is linux's default TTL. All network protocols in all stacks used +// with this package must have this value set as their default TTL. +const DefaultTTL = 64 + const sizeOfInt32 int = 4 var errStackType = syserr.New("expected but did not receive a netstack.Stack", linux.EINVAL) @@ -833,7 +837,7 @@ func GetSockOpt(t *kernel.Task, s socket.Socket, ep commonEndpoint, family int, return getSockOptIPv6(t, ep, name, outLen) case linux.SOL_IP: - return getSockOptIP(t, ep, name, outLen) + return getSockOptIP(t, ep, name, outLen, family) case linux.SOL_UDP, linux.SOL_ICMPV6, @@ -1176,8 +1180,25 @@ func getSockOptIPv6(t *kernel.Task, ep commonEndpoint, name, outLen int) (interf } // getSockOptIP implements GetSockOpt when level is SOL_IP. -func getSockOptIP(t *kernel.Task, ep commonEndpoint, name, outLen int) (interface{}, *syserr.Error) { +func getSockOptIP(t *kernel.Task, ep commonEndpoint, name, outLen int, family int) (interface{}, *syserr.Error) { switch name { + case linux.IP_TTL: + if outLen < sizeOfInt32 { + return nil, syserr.ErrInvalidArgument + } + + var v tcpip.TTLOption + if err := ep.GetSockOpt(&v); err != nil { + return nil, syserr.TranslateNetstackError(err) + } + + // Fill in the default value, if needed. + if v == 0 { + v = DefaultTTL + } + + return int32(v), nil + case linux.IP_MULTICAST_TTL: if outLen < sizeOfInt32 { return nil, syserr.ErrInvalidArgument @@ -1648,6 +1669,20 @@ func setSockOptIP(t *kernel.Task, ep commonEndpoint, name int, optVal []byte) *s t.Kernel().EmitUnimplementedEvent(t) return syserr.ErrInvalidArgument + case linux.IP_TTL: + v, err := parseIntOrChar(optVal) + if err != nil { + return err + } + + // -1 means default TTL. + if v == -1 { + v = 0 + } else if v < 1 || v > 255 { + return syserr.ErrInvalidArgument + } + return syserr.TranslateNetstackError(ep.SetSockOpt(tcpip.TTLOption(v))) + case linux.IP_ADD_SOURCE_MEMBERSHIP, linux.IP_BIND_ADDRESS_NO_PORT, linux.IP_BLOCK_SOURCE, @@ -1673,7 +1708,6 @@ func setSockOptIP(t *kernel.Task, ep commonEndpoint, name int, optVal []byte) *s linux.IP_RETOPTS, linux.IP_TOS, linux.IP_TRANSPARENT, - linux.IP_TTL, linux.IP_UNBLOCK_SOURCE, linux.IP_UNICAST_IF, linux.IP_XFRM_POLICY, |